如何在selenium python中按enter键?

我想在Instagram中搜索一个特殊的关键字。例如,我想搜索这个词:“快餐”。我可以在搜索框中发送此密钥。但是,当我使用Python3在Selenium中使用submit方法时,它不起作用,并且给我带来了错误。这是我的代码:

from selenium import webdriver
from selenium.webdriver.common.keys import Keys
from selenium.webdriver.common.alert import Alert
from selenium.webdriver.support.ui import WebDriverWait as wait
from selenium.webdriver.support import expected_conditions as EC
import time
driver = webdriver.Firefox()
url="https://www.instagram.com/p/pTPI-kyX7g/?tagged=resurant"
driver.get(url)

#login_button=driver.find_element_by_xpath("""/html/body/span/section/main/article/div[2]/div[2]/p/a""")
#login_button.click()
import time
driver.implicitly_wait(5)
search_button=driver.find_element_by_xpath("""/html/body/span/section/nav/div[2]/div/div/div[2]/input""")
search_button.send_keys("fast food")
search_button.submit()

这是给定的错误:

selenium.common.exceptions.NoSuchElementException: Message: Unable to locate element: ./ancestor-or-self::form

你能帮我吗?